Fix recursive call in the count field method

I was not handling the recursive call in the count field methods of the
completeness metric properly. Only the property schema should be passed.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>
Fix weighted completeness metric

I had to switch the two initializer statements in the constructor of the
weighted completeness metric to make it work again.

Signed-off-by: Konrad Reiche <konrad.reiche@gmail.com>